4BSD/usr/include/sys/vmclust.h

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/*	vmclust.h	4.1	11/9/80	*/

/*
 * Page clustering macros.
 * 
 * dirtycl(pte)			is the page cluster dirty?
 * anycl(pte,fld)		does any pte in the cluster has fld set?
 * zapcl(pte,fld) = val		set all fields fld in the cluster to val
 * distcl(pte)			distribute high bits to cluster; note that
 *				distcl copies everything but pg_pfnum,
 *				INCLUDING pg_m!!!
 *
 * In all cases, pte must be the low pte in the cluster, even if
 * the segment grows backwards (e.g. the stack).
 */
#define	H(pte)	((struct hpte *)(pte))

#if CLSIZE==1
#define	dirtycl(pte)	dirty(pte)
#define	anycl(pte,fld)	((pte)->fld)
#define	zapcl(pte,fld)	(pte)->fld
#define	distcl(pte)
#endif

#if CLSIZE==2
#define	dirtycl(pte)	(dirty(pte) || dirty((pte)+1))
#define	anycl(pte,fld)	((pte)->fld || (((pte)+1)->fld))
#define	zapcl(pte,fld)	(pte)[1].fld = (pte)[0].fld
#endif

#if CLSIZE==4
#define	dirtycl(pte) \
    (dirty(pte) || dirty((pte)+1) || dirty((pte)+2) || dirty((pte)+3))
#define	anycl(pte,fld) \
    ((pte)->fld || (((pte)+1)->fld) || (((pte)+2)->fld) || (((pte)+3)->fld))
#define	zapcl(pte,fld) \
    (pte)[3].fld = (pte)[2].fld = (pte)[1].fld = (pte)[0].fld
#endif

#ifndef distcl
#define	distcl(pte)	zapcl(H(pte),pg_high)
#endif